Sheet-metal tank.



J. F. LESLIE.

SHEET METAL TANK.

APPLICATION FILED AUG.8. I9I4.

l 1 92,538. l Patented July 25, 1916.

WL @f @727 0M" JOHN F. LSLIE, 0F MADISON, WISCONSIN.

SHEET-METAL TANK.

, Application led August 8, 1914.

To all whom t mali/ concern.'

Be it known that I, JOHN F. LESLIE, a citizen of the United States,residing at Madison, in the county of Dane and State of lVisconsin, haveinvented certain new and useful Improvements in Sheet-Metal Tanks, ofwhich the following is a specification.

My invention relates primarily to sheet metal receptacles, andparticularly to a joint connection between the bottom and side wall orwalls of such receptacle, whereby to provide a. secure non-leaking jointwithout the use .of solder or like sealing mediums.

The main object of the present invention resides in the provision of aseam or joint wherein the material of the side wall or walls and thebottom are utilized as joint forming elements to form a reinforce forthe bottom, and the joint forming elements so formed that theyk coperateto receive and hold a. sealing strip"to provide a water tight joint.

The invention in its preferred form of detailsl will be described in thefollowing specification, reference being had particularly to theaccompanying drawings, in which Figure 1 is a vertical sectional view ofa receptacle, showing the bottom connected in place by the improvedjoint. Fig. 2 is a fragmentary sectional view showing the jointpartially completed, and Fig. 3 is a similar View, showing the joint inits complete state.

The tank'may be of any form and may be fashioned froln sheet metal orany other suitable material, the same in the present instance beingvshown of circular formation.

In forming the joint, the material of the side wall or walls 1 of thereceptacle, is projected laterally and outwardlyat its lower portion,and is given a convex formation in cross-section, as indicated at 2 (seeFig. 2), then downwardly in parallelism with the wall, as at 3, thenlaterally and inwardly, as at t, and then return bent upon the lastmentioned section, as at 5, the bend 6 being projected upwardly abovethe plane of the section 5, thereby providing a flange, the purpose ofwhich will be presently eX- plained. The sections 2 and 5 are spacedapart a sufficient distance to receive the bottom 7, and a sealing strip8 between them, the sealing strip being preferably of rubber or otherwater-proof fabric, and formed in Specification of Letters Patent.

Patented July 25, 1916.

Serial No. 855,727.

long strips which may be quickly handled for placement in its properposition.

The bottom 7 is crimped so as to form a depressed rim section 9coextensive in width with the sealing strip S, an upper shoulder 10 anda lower shoulder 11 being fashioned by such crimping of the metal, theupper surface of the rim section serving as a seat for the sealingstrip, and the shoulder 10 serving as a stop to prevent inwarddisplacement of said strip and the section 8 preventing outwarddisplacement thereof, the bottom and the side wall sections thus forminga pocket for the sealing strip. The flange 6, heretofore described, isadapted to engage the lower shoulder 11 of the bottom member, toreinforce and support the bottom against downward vpressure at thatpoint, and to interlock the bottom and the section 5 against relativeedgewise movement.

In its finished state the joint is as shown in Fig. 3, a retainingelement, as a rivet 12, is passed through the joint sections, thebottom, and the sealing strip, which elements are all firmly drawntogether, and, in doing which, the convex section 2 is forced into asubstantially fiat formation, thereby causing said section to belengthened crosswise, and by virtue of the downward pressure thereoncausing the point 13 formed by the angle of the side wall 1 and saidsection to bite into the strip, thereby firmly clamping the sealingstrip at that point to provide a thoroughly water-tight joint.

It will of course be understood that in the mechanical formation of thejoint the material of the-side wall will first be bent laterally andoutwardly, the bottom next applied, and the joint completed around theedge of the bottom, after which the sealing strip is positioned and theparts all drawn tightly together by suitable retaining devices.

Having thus described my invention, what is claimed is 1. A receptaclecomprising a side wall having its lower portion bent laterally andloutwardly and then inwardly to form relatively spaced upper and lowerjoint sections, a downwardly projecting ridge being formed at thejuncture of the upper joint section and side wall, a bottom extendingbeyond the side wall and between said joint sections, a yielding sealingstrip interposed between retaining means for drawing said elementstogether and cause said ridge to bite into the sealing strip to form awater tight joint.

2. A receptacle comprising a l side wall having its lower portion bentto provide an upper laterally and outwardly extending joint section withthe point of bend forming an inner and downwardly projecting ridge,thence bent inwardly in spaced relation with said upper joint sectionand folded upon itself to form a lower joint section having a bead atthe point of its inner bend extending above the upper surface of saidfold and disposed inwardly of the projecting ridge of the upper jointsection, a bottom member extending beyond the side wall and between saidjoint sections having a marginal depression forming shoulders on theupper and lower sides thereof, the shoulder on the the upper side of thebottom member being adapted to prevent inward spread of the sealingstrip.

In testimony whereof I aiiix my signature in presence of two witnesses.

JOHN F. LESLIE. Witnesses:

L. W. COOK, L. M. DAMMENSGHMIDT.

